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POWER GENERATION AND TRANSMISSION
43
TEMPLATES FOB DRILLING STANDARD AND LOW-PRESSURE FLANGED
American Standard
Size, inches	Diameter of flanges, inches	Thickness of flanges, inches	Bolt circle diameter, inches	Number of bolts	Size of bolts, inches
4	9	%	7M	8	
4M	9%	%	7%	8	%
5	10	%	8H	8	%
6	11	1	9H	8	H
7	12H	IMe	10%	8	H
8	13H	IK	11%	8	H
9	15	IK	13%	12	H
10	16	16	14%	12	ys
12	19	IK	17	12	%
14	21	1%	18%	12	i
15	22%	IK	20	16	i
16	23K	IKe	21%	16	i
18	25	IK 6	22%	16	i
20	27K	1^6	25	20	i
22	29K	1'He	27%	20	1J4
24	32	1M	29H	20	Ui
26	34%	2	31%	24	IK
28	36M	2Ke	34	28	i
30	38%	2^	36	28	i
32	41%	2K	38H	28	i
34	43%	2^6	40H	32	IK
36	46	2M	42%	32	IK
38	48%	2^	45%	32	1%
40	50%	2H	47%	36	i
42	53	2%	49}i	36	IK
44	55%	2%	51%	40	IK
46	57%	2HG	53%	40	IK
48	59>	2M	56	44	IK
1 These templates are in multiples of four, so that fittings may be made to face in any quarter and bolt holes straddle the center line. Bolt holes are drilled > in. larger than nominal diarn. of bolts.